diff --git a/README.md b/README.md
index a69acf0..8fc45a3 100644
--- a/README.md
+++ b/README.md
@@ -70,12 +70,13 @@ A check that throws, hangs past `timeout`, or returns anything else fails
 itself closed; its siblings still run. Jev transport failures fail closed.
 
 Jev sees `{ input, output, expectedOutput, steps }`, and a case's string and
-`ask` checks answer in one call. The model is not configured on `jev()`.
+`ask` checks answer in one call. The model is not configured on `systemOne()`.
 Build it with `judgeModel({ model, invokeStep, thresholds, escalate, timeout })`
 from `@corbits/evals/workflow`. `model` is one workflow step (or a one-step
 workflow). `invokeStep` runs that step; its input is `{ state, questions }`
 and its output is `{ decisions }` or `{ fallback: true, reason }`.
-`jev({ thresholds, escalate })` only sets bars and an escalation agent.
+`systemOne({ thresholds, escalate })` only sets bars and an escalation agent.
+`jev` is an alias of `systemOne`.
 
 Thresholds: a yes/no check passes at p(yes) >= `yes` and fails at
 p(yes) <= `no` (0.7 / 0.3); `ask` fails as unsure when its top
@@ -85,7 +86,7 @@ Thresholds are tuned to a judge version, so pin the step agent's model
 when they must stay stable.
 
 Escalation: `sure` doubles as the escalation gate. Give the judge an
-agent — `escalate` on `jev` or `judgeModel`, anything with
+agent — `escalate` on `systemOne` or `judgeModel`, anything with
 `send(prompt)` returning `{ type: "reply", reply }` or
 `{ type: "suspended" }`, e.g. an `@intx/agent` agent from a `@corbits/*`
 adapter — and every unsure decision is re-asked with the exact answer
diff --git a/e2e/jev.e2e.test.ts b/e2e/jev.e2e.test.ts
index 12c8dcd..53a4e3d 100644
--- a/e2e/jev.e2e.test.ts
+++ b/e2e/jev.e2e.test.ts
@@ -9,7 +9,7 @@ import {
   ask,
   EvalFailure,
   runEvaluation,
-  jev,
+  systemOne,
   type Scorer,
   type Escalation,
   type Judge,
@@ -246,8 +246,8 @@ describe("thresholds", () => {
   });
 
   test("bad thresholds throw at definition", async () => {
-    expect(() => jev({ thresholds: { yes: 0.3, no: 0.5 } })).toThrow("must not exceed");
-    expect(() => jev({ thresholds: { sure: 1.5 } })).toThrow("[0, 1]");
+    expect(() => systemOne({ thresholds: { yes: 0.3, no: 0.5 } })).toThrow("must not exceed");
+    expect(() => systemOne({ thresholds: { sure: 1.5 } })).toThrow("[0, 1]");
     expect(() => ask("Ready?", { options: { a: "a" }, pass: "a", sure: 0 })).toThrow("(0, 1]");
     const { judge } = stubJev(noul(0.9));
     await expect(judged({ question, yes: 0.2, no: 0.5 }, judge)).rejects.toThrow(
@@ -589,7 +589,7 @@ describe("judgeModel", () => {
         task: (input: string) => input,
         data: "/no/such/cases.jsonl",
         scorers: { ready: ask("Ready?", { options: { a: "a" }, pass: "a" }) },
-        judge: jev({ thresholds: { yes: 0.9 } }),
+        judge: systemOne({ thresholds: { yes: 0.9 } }),
       }),
     ).rejects.toThrow("judge.invoke");
     const report = await runEvaluation({
diff --git a/src/index.ts b/src/index.ts
index 5ab8218..7011680 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -42,6 +42,7 @@ export {
 export type { Experiment, ExperimentRow } from "./reports.js";
 export {
   ask,
+  systemOne,
   jev,
   DEFAULTS,
   type Ask,
diff --git a/src/jev.ts b/src/jev.ts
index 107a081..060e072 100644
--- a/src/jev.ts
+++ b/src/jev.ts
@@ -29,7 +29,7 @@ export type Judge = {
   readonly thresholds?: Resolved;
   readonly escalate?: Escalation;
   /**
-   * One call per case attempt. `judgeModel` sets this; `jev()` alone does not,
+   * One call per case attempt. `judgeModel` sets this; `systemOne()` alone does not,
    * so it is not a model.
    * Resolves to `{ decisions }` or `{ fallback: true, reason, detail? }`.
    */
@@ -63,7 +63,8 @@ function resolve(label: string, raw: Thresholds): Resolved {
   return out;
 }
 
-export function jev(options: JevOptions = {}): Judge {
+/** Thresholds and an optional escalation agent. Not a model and not an HTTP client. */
+export function systemOne(options: JevOptions = {}): Judge {
   const thresholds =
     options.thresholds === undefined ? undefined : resolve("thresholds", options.thresholds);
   return {
@@ -72,6 +73,9 @@ export function jev(options: JevOptions = {}): Judge {
   };
 }
 
+/** Same function as `systemOne`. */
+export { systemOne as jev };
+
 /** A Jev question with named answers. A plain string check is the yes/no case. */
 export type Ask = {
   readonly question: string;
diff --git a/src/workflow.ts b/src/workflow.ts
index 4a186c9..52da52c 100644
--- a/src/workflow.ts
+++ b/src/workflow.ts
@@ -10,7 +10,7 @@ import {
 } from "@intx/workflow";
 
 import { TRACE, type Traced } from "./runs.js";
-import { jev, type Escalation, type Judge, type Thresholds } from "./jev.js";
+import { systemOne, type Escalation, type Judge, type Thresholds } from "./jev.js";
 import { toMs, type Duration } from "./timeout.js";
 import type { Step } from "./types.js";
 
@@ -155,7 +155,7 @@ export function judgeModel(options: JudgeModelOptions): Judge {
     trigger: { type: "manual" },
     steps: { judge: forced },
   });
-  const base = jev({
+  const base = systemOne({
     ...(options.thresholds === undefined ? {} : { thresholds: options.thresholds }),
     ...(options.escalate === undefined ? {} : { escalate: options.escalate }),
   });